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libceph: handle discarding acked and requeued messages separately 

Make it easier to follow and remove dependency on msgr1 specific
CEPH_MSGR_TAG_SEQ.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
zero-sugar-mainline-defconfig
Ilya Dryomov 2020-10-13 17:38:53 +02:00
parent 5cd8da3a1c
commit 0247192809
1 changed files with 54 additions and 20 deletions
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74
net/ceph/messenger.c
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@ -760,6 +760,56 @@ static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
return ret;
}
/*
* Discard messages that have been acked by the server.
*/
static void ceph_con_discard_sent(struct ceph_connection *con, u64 ack_seq)
{
struct ceph_msg *msg;
u64 seq;
dout("%s con %p ack_seq %llu\n", __func__, con, ack_seq);
while (!list_empty(&con->out_sent)) {
msg = list_first_entry(&con->out_sent, struct ceph_msg,
list_head);
WARN_ON(msg->needs_out_seq);
seq = le64_to_cpu(msg->hdr.seq);
if (seq > ack_seq)
break;
dout("%s con %p discarding msg %p seq %llu\n", __func__, con,
msg, seq);
ceph_msg_remove(msg);
}
}
/*
* Discard messages that have been requeued in con_fault(), up to
* reconnect_seq. This avoids gratuitously resending messages that
* the server had received and handled prior to reconnect.
*/
static void ceph_con_discard_requeued(struct ceph_connection *con,
u64 reconnect_seq)
{
struct ceph_msg *msg;
u64 seq;
dout("%s con %p reconnect_seq %llu\n", __func__, con, reconnect_seq);
while (!list_empty(&con->out_queue)) {
msg = list_first_entry(&con->out_queue, struct ceph_msg,
list_head);
if (msg->needs_out_seq)
break;
seq = le64_to_cpu(msg->hdr.seq);
if (seq > reconnect_seq)
break;
dout("%s con %p discarding msg %p seq %llu\n", __func__, con,
msg, seq);
ceph_msg_remove(msg);
}
}
static void con_out_kvec_reset(struct ceph_connection *con)
{
BUG_ON(con->out_skip);
@ -2259,28 +2309,12 @@ static int read_partial_ack(struct ceph_connection *con)
*/
static void process_ack(struct ceph_connection *con)
{
struct ceph_msg *m;
u64 ack = le64_to_cpu(con->in_temp_ack);
u64 seq;
bool reconnect = (con->in_tag == CEPH_MSGR_TAG_SEQ);
struct list_head *list = reconnect ? &con->out_queue : &con->out_sent;
/*
* In the reconnect case, con_fault() has requeued messages
* in out_sent. We should cleanup old messages according to
* the reconnect seq.
*/
while (!list_empty(list)) {
m = list_first_entry(list, struct ceph_msg, list_head);
if (reconnect && m->needs_out_seq)
break;
seq = le64_to_cpu(m->hdr.seq);
if (seq > ack)
break;
dout("got ack for seq %llu type %d at %p\n", seq,
le16_to_cpu(m->hdr.type), m);
ceph_msg_remove(m);
}
if (con->in_tag == CEPH_MSGR_TAG_ACK)
ceph_con_discard_sent(con, ack);
else
ceph_con_discard_requeued(con, ack);
prepare_read_tag(con);
}